same thing here. The translatable seems to be set to undefined in the draggable util's applyTranslatable method.
*edit: the applyTranslatable method appears to be being called twice - once with the translatable argument correctly set, and once with it undefined. Obviously editing source is very ugly, but I'm going to go ahead and assume sencha will fix this for final release.
Given that, this patch of applyTranslatable is doing the job for me (this is on line 162 of touch/src/util/Draggable.js):